Magnesium malate is also a highly absorbable form, like the citrate. You might want to give that a try. Also, the herb Red Raspberry is high in magnesium. It's often used for menstrual and labor pain and cramping...magnesium acts like a natural muscle relaxant. Of course, the herb doesn't have nearly the same milligram amount as the capsules/tablets, so you may need to take a lot in order to get similar results. If you end up with loose stools, then just reduce the amount. Red raspberry makes a delicious tea or you can take it in capsule or liquid form. Here's more info about it: Red Raspberry or Red Raspberry Blend (alcohol-free liquid extract)

Also: buy Red Raspberry or buy Red Raspberry Blend